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PROFESSOR BAWENDI: The only But it's hard to imagine an irreversible compression the way we can just imagine an irreversible expansion.
,但是我们很难,像描述不可逆膨胀一样,来描述不可逆压缩。
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Adiabatic meaning there's no heat involved, and we're going to see how that differs from the isothermal expansion and compression.
绝热意味着没有热量的传递，我们将看到它,与等温过程的区别。
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We transition to actually real world applications later on like a compression-- how do you take a huge amount of data ; and actually whittle it down into something more manageable; something that uses less of your disk space.
然后我们会讲生活中的应用程序,比方说压缩文件——,把大量的数据分解使其更易管理;,并占用尽量少的磁盘空间。
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You have to do it awfully fast to get your irreversible compression.
我们要压缩得非常快,才能实现不可逆压缩。
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Then we're going to have another isothermal step, a compression to some point four.
然后有另外一个绝热过程，绝热压缩到4点。
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And now we're going to have another adiabatic step, an adiabatic compression.
现在我们进行另外一步，绝热收缩过程。
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So if you've got to pump that tire really a lot, then you're going to you're going to really feel a lot of heat there. The compression of the basically it's an adiabatic compression.
所以若果你给轮胎，打了很多的气，你会觉得你感觉,阀门那儿非常的烫，这种压缩,基本上是一个绝热的压缩。
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Our constraint is going to be an adiabatic expansion or compression.
现在约束改成了,绝热膨胀，或者压缩。
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Compression you're expected to heat up, right?
压缩会升温，没错吧？
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Step three to four isothermal compression, w2 delta u is going to be q2 plus w2.
第三步，到四点的等温压缩，Δu等于q2加。
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